Fatto generale: 21941 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21941 is an uninteresting number.
Trivia: 21941 is a boring number.
Data storica: January 26th is the day in 1564 that the Grand Duchy of Lithuania defeats the Tsardom of Russia in the Battle of Ula during the Livonian War.